Service manual

2. TROUBLESHOOTING
2.16 Service Manual CNS-9701
Touch Screen Problem
Sound Problem
Problem Possible Cause Action
The RS232C straight cable has
poor contact between the display
unit and main unit.
Check the continuity of the cable with a
multimeter and check the connection.
The touch screen control board has
afailure.
Replace the board with a new one.
The touch screen is damaged.
The touch screen does not work.
The film cable of the touch screen
has a break.
Replace the touch screen with a new one.
- Effective area varies on the
touch screen.
- The touch screen sometimes
works.
The touch screen control board has
an error due to noise.
Turn off the display unit and turn it on to
initialize the display unit.
If there is still the same problem or it
occurs again, replace the board with a new
one.
The display unit is moved to upper
or lower location.
The pressed position and
activated position do not match.
The position data is changed by
noise.
Calibrate the touch screen at the
Touchscreen Setting window of the System
Setup.
Problem Possible Cause Action
The main unit intermittently
generates a beep sound.
A key on the keyboard is pressed
and held.
Release the key.
Poor contact of the speaker cable. Check the continuity of the speaker cable
and connector connection.
Failure of the speakers in the
display unit.
Replace the speakers with new ones.
No alarm and QRS sounds.
Failure of the motherboard in the
main unit.
Replace the motherboard with a new one.
Abnormal low noise from the
main unit.
Dust or lint on the cooling fan for
the CPU or in the power supply
unit.
Clean the fans with an air compressor.